adj. 25B6; adjective
the place smelled awful : DISGUSTING, nasty, terrible, dreadful, ghastly, horrible, vile, foul, revolting, repulsive, repugnant, odious, sickening, nauseating; informal yucky, sick-making, gross; Brit. informal beastly; poetic/literary noisome.
an awful book : DREADFUL, terrible, frightful, atrocious, execrable; inadequate, inferior, substandard, lamentable; informal crummy, pathetic, rotten, woeful, lousy, appalling, abysmal, dire, poxy; Brit. informal duff, rubbish.
an awful accident : SERIOUS, grave, bad, terrible, dreadful.
you look awfulgo and lie down : ILL, unwell, sick, peaky, queasy, nauseous; Brit. off colour, poorly; informal rough, lousy, rotten, terrible, dreadful; Brit. informal grotty, ropy; Scottish informal wabbit, peely-wally; Austral./NZ informal crook; dated queer, seedy.
I felt awful for getting so angry : REMORSEFUL, guilty, ashamed, contrite, sorry, regretful, repentant, self-reproachful.
(archaic) the awful sights of nature : AWE-INSPIRING, awesome, impressive; dread, fearful.
wonderful.